def xywh_to_ltrb(xywh):
"""Convert a box coordinate from xywh to ltrb.
Parameters
----------
xywh: (num_boxes, (x, y, w, h) location)
The box location in (x, y, w, h) coordinate.
Returns
-------
ltrb: (num_boxes, (l, t, r, b) location)
The box location in (l, t, r, b) coordinate.
"""
l = xywh[:, 0] - xywh[:, 2] / 2.
t = xywh[:, 1] - xywh[:, 3] / 2.
r = xywh[:, 0] + xywh[:, 2] / 2.
b = xywh[:, 1] + xywh[:, 3] / 2.
# Make sure consistent shape.
l = tf.reshape(l, (tf.shape(xywh)[0], 1))
t = tf.reshape(t, (tf.shape(xywh)[0], 1))
r = tf.reshape(r, (tf.shape(xywh)[0], 1))
b = tf.reshape(b, (tf.shape(xywh)[0], 1))
with tf.control_dependencies(
[tf.assert_non_negative(r - l),
tf.assert_non_negative(b - t)]):
ltrb = tf.concat([l, t, r, b], axis=1)
return ltrb
def ltrb_to_xywh(ltrb):
"""Convert a box coordinate from ltrb to xywh.
Parameters
----------
ltrb: (num_boxes, (l, t, r, b) location)
The box location in (l, t, r, b) coordinate.
Returns
-------
xywh: (num_boxes, (x, y, w, h) location)
The box location in (x, y, w, h) coordinate.
"""
x = (ltrb[:, 0] + ltrb[:, 2]) / 2.
y = (ltrb[:, 1] + ltrb[:, 3]) / 2.
w = ltrb[:, 2] - ltrb[:, 0]
h = ltrb[:, 3] - ltrb[:, 1]
# Make sure consistent shape.
x = tf.reshape(x, (tf.shape(ltrb)[0], 1))
y = tf.reshape(y, (tf.shape(ltrb)[0], 1))
w = tf.reshape(w, (tf.shape(ltrb)[0], 1))
h = tf.reshape(h, (tf.shape(ltrb)[0], 1))
with tf.control_dependencies(
[tf.assert_non_negative(w),
tf.assert_non_negative(h)]):
xywh = tf.concat([x, y, w, h], axis=1)
return xywh
def mix_prediction(losses,
lam=0.,
mean_typ='arithmetic',
weight_typ='normal',
sign=-1.,
sf=1e-3):
# losses is shape (# of discriminators x batch_size)
# output is scalar
tf.assert_non_negative(lam)
assert mean_typ in ['arithmetic', 'geometric', 'harmonic']
assert weight_typ in ['normal', 'log']
assert sign == 1. or sign == -1.
assert sf > 0.
if lam == 0.:
weights = tf.ones_like(losses)
else:
if weight_typ == 'log':
weights = tf.pow(losses, lam)
else:
weights = tf.exp(lam * losses)
if mean_typ == 'arithmetic':
loss = weighted_arithmetic(weights, losses)
elif mean_typ == 'geometric':
log_losses = tf.log(sign * losses)
loss = sign * tf.exp(weighted_arithmetic(weights, log_losses))
else:
mn = tf.reduce_min(losses) - sf
inv_losses = tf.reciprocal(losses - mn)
loss = mn + tf.reciprocal(weighted_arithmetic(weights, inv_losses))
return loss
def eval(self, X, Y):
b = self.b
c = self.c
sumx2 = tf.reshape(tf.reduce_sum(X**2, 1), [-1, 1])
sumy2 = tf.reshape(tf.reduce_sum(Y**2, 1), [1, -1])
with tf.control_dependencies([
tf.assert_non_negative(sumx2, name="sumx2_nonneg"),
tf.assert_non_negative(sumy2, name="sumy2_nonneg")
]):
D2 = sumx2 - 2.0 * tf.matmul(X, Y, transpose_b=True) + sumy2
D2_no0 = tf.maximum(0.0, D2)
with tf.control_dependencies(
[tf.assert_non_negative(D2_no0, name="D2_nonneg")]):
K = (c**2 + D2_no0)**b
return K
def _maybe_validate_rightmost_transposed_ndims(
rightmost_transposed_ndims, validate_args, name=None):
"""Checks that `rightmost_transposed_ndims` is valid."""
with tf.name_scope(name, 'maybe_validate_rightmost_transposed_ndims',
[rightmost_transposed_ndims]):
assertions = []
if not rightmost_transposed_ndims.dtype.is_integer:
raise TypeError('`rightmost_transposed_ndims` must be integer type.')
if rightmost_transposed_ndims.shape.ndims is not None:
if rightmost_transposed_ndims.shape.ndims != 0:
raise ValueError('`rightmost_transposed_ndims` must be a scalar, '
'saw rank: {}.'.format(
rightmost_transposed_ndims.shape.ndims))
elif validate_args:
assertions += [tf.assert_rank(rightmost_transposed_ndims, 0)]
rightmost_transposed_ndims_ = tensor_util.constant_value(
rightmost_transposed_ndims)
msg = '`rightmost_transposed_ndims` must be non-negative.'
if rightmost_transposed_ndims_ is not None:
if rightmost_transposed_ndims_ < 0:
raise ValueError(msg[:-1] + ', saw: {}.'.format(
rightmost_transposed_ndims_))
elif validate_args:
assertions += [tf.assert_non_negative(
rightmost_transposed_ndims, message=msg)]
return assertions
def bernoulli_sample_test():
# import os
# os.environ['CUDA_DEVICE_ORDER'] = 'PCI_BUS_ID'
# os.environ['CUDA_VISIBLE_DEVICES'] = ''
g = tf.Graph()
with g.as_default():
tf.set_random_seed(4896)
logits = tf.random_uniform(
shape=[128, 256],
minval=-5,
maxval=5,
dtype=tf.float32,
)
probs = tf.nn.sigmoid(logits)
sample = bernoulli_sample_sigmoid(logits)
grad_probs = tf.gradients(probs, logits)
grad_sample = tf.gradients(sample, logits)
with tf.control_dependencies(
[tf.assert_equal(grad_probs, grad_sample)]):
grad_probs = tf.identity(grad_probs)
with tf.control_dependencies([tf.assert_non_negative(sample)]):
grad_probs = tf.identity(grad_probs)
init_fn = tf.global_variables_initializer()
sess = tf.Session(graph=g)
with sess:
sess.run(init_fn)
grad_probs = sess.run(grad_probs)
print('Tests passed: `bernoulli_sample_sigmoid`')
def test_raises_when_negative(self):
with self.test_session():
zoe = tf.constant([-1, -2], name="zoe")
with tf.control_dependencies([tf.assert_non_negative(zoe)]):
out = tf.identity(zoe)
with self.assertRaisesOpError("zoe"):
out.eval()
def add_loss_op(self, result):
logits = result.rnn_output
with tf.control_dependencies(
[tf.assert_positive(tf.shape(logits)[1],
data=[tf.shape(logits)])]):
length_diff = tf.reshape(self.config.max_length -
tf.shape(logits)[1],
shape=(1, ))
padding = tf.reshape(tf.concat([[0, 0, 0], length_diff, [0, 0]],
axis=0),
shape=(3, 2))
preds = tf.pad(logits, padding, mode='constant')
# add epsilon to avoid division by 0
preds = preds + 1e-5
mask = tf.sequence_mask(self.output_length_placeholder,
self.config.max_length,
dtype=tf.float32)
loss = tf.contrib.seq2seq.sequence_loss(preds, self.output_placeholder,
mask)
with tf.control_dependencies([
tf.assert_non_negative(loss,
data=[preds, mask],
summarize=256 * 60 * 300)
]):
return tf.identity(loss)
def lm_symbols_to_logprobs_fn(ids,
unused_i,
cache,
inf_mask_tf=zero_mask_tf):
"""Go from ids to logits for next symbol."""
ids = ids[:, -1:]
# Map from lip to lm indices
lm_ids = table.lookup(ids)
with tf.control_dependencies(
[tf.assert_non_negative(lm_ids, [lm_ids])]):
with tf.variable_scope(
top_scope,
reuse=True): # we have initialized LM outside
model_pl = CharRnnLm(input_data=lm_ids,
initial_state=cache["lm_state"],
args=self.clm_opts,
training=False)
probs_lm, cache["lm_state"] = model_pl.probs, model_pl.final_state
lm_probs_mapped_to_lip = tf.gather(probs_lm,
chars2lip_keys,
axis=-1)
lm_probs_mapped_to_lip *= zero_mask_tf # mask out indices with no lip correspondence
lm_logprobs = tf.log(
lm_probs_mapped_to_lip) # Entries with value 0 will get -Inf
return lm_logprobs, cache
def bounds_unlabeled(lower: float,
upper: float,
tensor: tf.Tensor,
name: Optional[str] = None) -> tf.Tensor:
"""Checks the tensor elements fall in the given bounds.
Args:
lower: The lower bound.
upper: The upper bound.
tensor: The input tensor.
name: Optional op name.
Returns:
The input tensor.
"""
with tf.name_scope(name, 'check_bounds', [tensor]) as scope:
if FLAGS.tensorcheck_enable_checks:
lower_bound_op = tf.assert_non_negative(
tensor - lower, name='lower_bound')
upper_bound_op = tf.assert_non_positive(
tensor - upper, name='upper_bound')
with tf.control_dependencies([lower_bound_op, upper_bound_op]):
tensor = tf.identity(tensor, name=scope)
return tensor
def get_sample_ndims(self, x, name="get_sample_ndims"):
"""Returns number of dimensions corresponding to iid draws ("sample").
Args:
x: `Tensor`.
name: Python `str`. The name to give this op.
Returns:
sample_ndims: `Tensor` (0D, `int32`).
Raises:
ValueError: if `sample_ndims` is calculated to be negative.
"""
with self._name_scope(name, values=[x]):
ndims = self.get_ndims(x, name=name)
if self._is_all_constant_helper(ndims, self.batch_ndims,
self.event_ndims):
ndims = tensor_util.constant_value(ndims)
sample_ndims = (ndims - self._batch_ndims_static -
self._event_ndims_static)
if sample_ndims < 0:
raise ValueError(
"expected batch_ndims(%d) + event_ndims(%d) <= ndims(%d)" %
(self._batch_ndims_static, self._event_ndims_static, ndims))
return tf.convert_to_tensor(sample_ndims, name="sample_ndims")
else:
with tf.name_scope(name="sample_ndims"):
sample_ndims = ndims - self.batch_ndims - self.event_ndims
if self.validate_args:
sample_ndims = control_flow_ops.with_dependencies(
[tf.assert_non_negative(sample_ndims)], sample_ndims)
return sample_ndims
def _maybe_validate_rightmost_transposed_ndims(
rightmost_transposed_ndims, validate_args, name=None):
"""Checks that `rightmost_transposed_ndims` is valid."""
with tf.name_scope(name, 'maybe_validate_rightmost_transposed_ndims',
[rightmost_transposed_ndims]):
assertions = []
if not rightmost_transposed_ndims.dtype.is_integer:
raise TypeError('`rightmost_transposed_ndims` must be integer type.')
if rightmost_transposed_ndims.shape.ndims is not None:
if rightmost_transposed_ndims.shape.ndims != 0:
raise ValueError('`rightmost_transposed_ndims` must be a scalar, '
'saw rank: {}.'.format(
rightmost_transposed_ndims.shape.ndims))
elif validate_args:
assertions += [tf.assert_rank(rightmost_transposed_ndims, 0)]
rightmost_transposed_ndims_ = tf.contrib.util.constant_value(
rightmost_transposed_ndims)
msg = '`rightmost_transposed_ndims` must be non-negative.'
if rightmost_transposed_ndims_ is not None:
if rightmost_transposed_ndims_ < 0:
raise ValueError(msg[:-1] + ', saw: {}.'.format(
rightmost_transposed_ndims_))
elif validate_args:
assertions += [tf.assert_non_negative(
rightmost_transposed_ndims, message=msg)]
return assertions
def test_raises_when_negative(self):
with self.test_session():
zoe = tf.constant([-1, -2], name="zoe")
with tf.control_dependencies([tf.assert_non_negative(zoe)]):
out = tf.identity(zoe)
with self.assertRaisesOpError("zoe"):
out.eval()
def sparsemax(attentionscores):
attentionscores = tf.contrib.sparsemax.sparsemax(attentionscores)
with tf.control_dependencies([
tf.assert_non_negative(attentionscores),
tf.assert_less_equal(attentionscores, 1., summarize=60)
]):
return tf.identity(attentionscores)
def get_sample_ndims(self, x, name="get_sample_ndims"):
"""Returns number of dimensions corresponding to iid draws ("sample").
Args:
x: `Tensor`.
name: Python `str`. The name to give this op.
Returns:
sample_ndims: `Tensor` (0D, `int32`).
Raises:
ValueError: if `sample_ndims` is calculated to be negative.
"""
with self._name_scope(name, values=[x]):
ndims = self.get_ndims(x, name=name)
if self._is_all_constant_helper(ndims, self.batch_ndims,
self.event_ndims):
ndims = tensor_util.constant_value(ndims)
sample_ndims = (ndims - self._batch_ndims_static -
self._event_ndims_static)
if sample_ndims < 0:
raise ValueError(
"expected batch_ndims(%d) + event_ndims(%d) <= ndims(%d)"
% (self._batch_ndims_static, self._event_ndims_static,
ndims))
return tf.convert_to_tensor(sample_ndims, name="sample_ndims")
else:
with tf.name_scope(name="sample_ndims"):
sample_ndims = ndims - self.batch_ndims - self.event_ndims
if self.validate_args:
sample_ndims = control_flow_ops.with_dependencies(
[tf.assert_non_negative(sample_ndims)],
sample_ndims)
return sample_ndims
def quantization_input_as_bins(x, k_center):
"""
quantization the input x to the k-bins structure
:param x: the input data
:param k_center: the number of bins
:return: quantized input
"""
# normalization input x to the k-bins vector
x = tf.cast(x, tf.float32)
x_shape = tf.shape(x)
x_ones = tf.ones_like(x) # create tensor the same shape as x
x_min_per_batch = tf.reduce_min(x, axis=0) # min per batch
x_min_per_image = tf.reduce_min(tf.reduce_min(x_min_per_batch, axis=0),
axis=0)
x_min_global = tf.reduce_min(x_min_per_image)
x_min_mat = tf.multiply(x_min_global, x_ones)
x_idx_0 = tf.subtract(x, x_min_mat)
assert_zeros1 = tf.assert_non_negative(x_idx_0)
with tf.control_dependencies([assert_zeros1]):
x_idx_0 = tf.identity(x_idx_0, name='x_idx_0')
x_max_per_batch = tf.reduce_max(x_idx_0, axis=0)
x_max_per_image = tf.reduce_max(tf.reduce_max(x_max_per_batch, axis=0),
axis=0)
x_max_global = tf.reduce_max(x_max_per_image, axis=0)
x_max_mat = tf.multiply(x_max_global, x_ones)
x_idx_01 = tf.div(x_idx_0, x_max_mat) # TODO
assert_zeros2 = tf.assert_non_negative(x_idx_01)
with tf.control_dependencies([assert_zeros2]):
x_idx_01 = tf.identity(x_idx_01, name='x_idx_01')
# [0..1]*(256-1)->[0..255]+1->[1..256] and then floor getting the interger not greater than x
k = tf.cast((k_center - 1), tf.float32)
x_idx = tf.multiply(x_idx_01, k)
x_idx = tf.round(x_idx)
# x_idx = tf.floor(tf.add(x_idx,1))
# x_idx = tf.floor(x_idx) # the range [0..255]because we have z index in the python list
x_idx = tf.cast(x_idx, tf.int32)
# indices have to be non negative
assert_zeros = tf.assert_non_negative(x_idx)
with tf.control_dependencies([assert_zeros]):
x_idx = tf.identity(x_idx, name='x_idx')
return x_idx
def normalize_prob(x, axis=None, name='normalize'):
with tf.name_scope(name) as scope:
with tf.control_dependencies([tf.assert_non_negative(x)]):
x = tf.identity(x)
z = tf.reduce_sum(x, axis=axis, keepdims=True)
with tf.control_dependencies([tf.assert_positive(z)]):
p = (1. / z) * x
return p
def _maybe_assert_valid_x(self, x):
if not self.validate_args or self.power == 0.:
return x
is_valid = tf.assert_non_negative(
1. + self.power * x,
message="Forward transformation input must be at least {}.".format(
-1. / self.power))
return control_flow_ops.with_dependencies([is_valid], x)
def _maybe_assert_valid_x(self, x):
if not self.validate_args or self.power == 0.:
return x
is_valid = tf.assert_non_negative(
1. + self.power * x,
message="Forward transformation input must be at least {}.".format(
-1. / self.power))
return control_flow_ops.with_dependencies([is_valid], x)
def _test_assertions(inf_tensors, gen_tensors, eval_tensors):
"""Returns in-graph assertions for testing."""
observed, latents, divs, log_probs, elbo = inf_tensors
generated, sampled_latents = gen_tensors
eval_log_probs, = eval_tensors
# For RNN, we return None from infer_latents as an optimization.
if latents is None:
latents = sampled_latents
def _same_batch_and_sequence_size_asserts(t1, name1, t2, name2):
return [
tf.assert_equal(util.batch_size_from_nested_tensors(t1),
util.batch_size_from_nested_tensors(t2),
message="Batch: " + name1 + " vs " + name2),
tf.assert_equal(util.sequence_size_from_nested_tensors(t1),
util.sequence_size_from_nested_tensors(t2),
message="Steps: " + name1 + " vs " + name2),
]
def _same_shapes(nested1, nested2):
return snt.nest.flatten(
snt.nest.map(
lambda t1, t2: tf.assert_equal(tf.shape(t1),
tf.shape(t2),
message="Shapes: " + t1.name +
" vs " + t2.name), nested1,
nested2))
def _all_same_batch_and_sequence_sizes(nested):
batch_size = util.batch_size_from_nested_tensors(nested)
sequence_size = util.sequence_size_from_nested_tensors(nested)
return [
tf.assert_equal(tf.shape(tensor)[0],
batch_size,
message="Batch: " + tensor.name)
for tensor in snt.nest.flatten(nested)
] + [
tf.assert_equal(tf.shape(tensor)[1],
sequence_size,
message="Steps: " + tensor.name)
for tensor in snt.nest.flatten(nested)
]
assertions = [
tf.assert_non_negative(divs),
tf.assert_non_positive(log_probs),
] + _same_shapes(
(log_probs, log_probs, observed, latents),
(divs, eval_log_probs, generated,
sampled_latents)) + _all_same_batch_and_sequence_sizes(
(observed, latents, divs)) + _all_same_batch_and_sequence_sizes(
(generated, sampled_latents))
vars_ = tf.trainable_variables()
grads = tf.gradients(-elbo, vars_)
for (var, grad) in zip(vars_, grads):
assertions.append(tf.check_numerics(grad, "Gradient for " + var.name))
return assertions
def cosine(template, search, is_training,
trainable=True,
use_batch_norm=False,
gain_init=1,
eps=1e-3,
scope='cosine'):
'''
Args:
template: [b, h, w, c]
search: [b, s, h, w, c]
'''
search = cnn.as_tensor(search)
num_search_dims = len(search.value.shape)
if num_search_dims != 5:
raise ValueError('search should have 5 dims: {}'.format(num_search_dims))
with tf.variable_scope(scope, 'cosine'):
# Discard receptive field of template and get underlying tf.Tensor.
template = cnn.get_value(template)
dot_xy = cnn.channel_sum(cnn.diag_xcorr(search, template, padding='VALID'))
dot_xx = tf.reduce_sum(tf.square(template), axis=(-3, -2, -1), keepdims=True)
sq_search = cnn.pixelwise(tf.square, search)
ones = tf.ones_like(template) # TODO: Faster and less memory to use sum.
dot_yy = cnn.channel_sum(cnn.diag_xcorr(sq_search, ones, padding='VALID'))
# num_channels = template.shape[-1].value
# template_size = template.shape[-3:-1].as_list()
# ones = tf.ones(template_size + [num_channels, 1], tf.float32)
# sq_search, restore = cnn.merge_batch_dims(sq_search)
# dot_yy = cnn.nn_conv2d(sq_search, ones, strides=[1, 1, 1, 1], padding='VALID')
# dot_yy = restore(dot_yy)
dot_xx = tf.expand_dims(dot_xx, 1)
assert_ops = [tf.assert_non_negative(dot_xx, message='assert dot_xx non negative'),
tf.assert_non_negative(dot_yy.value, message='assert dot_yy non negative')]
with tf.control_dependencies(assert_ops):
denom = cnn.pixelwise(lambda dot_yy: tf.sqrt(dot_xx * dot_yy), dot_yy)
similarity = cnn.pixelwise_binary(
lambda dot_xy, denom: dot_xy / (denom + eps), dot_xy, denom)
# Gain is necessary here because similarity is always in [-1, 1].
return _calibrate(similarity, is_training, use_batch_norm,
learn_gain=True,
gain_init=gain_init,
trainable=trainable)
def _inverse_log_det_jacobian(self, y):
# If event_ndims = 2,
# F^{-1}(y) = (-y, y), so DF^{-1}(y) = (-1, 1),
# so Log|DF^{-1}(y)| = Log[1, 1] = [0, 0].
zeros = tf.constant(0., dtype=y.dtype)
if self.validate_args:
zeros = control_flow_ops.with_dependencies(
[tf.assert_non_negative(y, message="Argument y was negative")], zeros)
return zeros, zeros
def _maybe_assert_valid(self, x):
if not self.validate_args:
return x
return control_flow_ops.with_dependencies([
tf.assert_non_negative(x, message="sample must be non-negative"),
tf.assert_less_equal(x,
tf.ones([], self.concentration0.dtype),
message="sample must be no larger than `1`."),
], x)
def _maybe_validate_shape_override(self, override_shape, base_is_scalar,
validate_args, name):
"""Helper to __init__ which ensures override batch/event_shape are valid."""
if override_shape is None:
override_shape = []
override_shape = tf.convert_to_tensor(override_shape,
dtype=tf.int32,
name=name)
if not override_shape.dtype.is_integer:
raise TypeError("shape override must be an integer")
override_is_scalar = _is_scalar_from_shape(override_shape)
if tf.contrib.util.constant_value(override_is_scalar):
return self._empty
dynamic_assertions = []
if override_shape.shape.ndims is not None:
if override_shape.shape.ndims != 1:
raise ValueError("shape override must be a vector")
elif validate_args:
dynamic_assertions += [
tf.assert_rank(override_shape,
1,
message="shape override must be a vector")
]
if tensor_util.constant_value(override_shape) is not None:
if any(s < 0 for s in tensor_util.constant_value(override_shape)):
raise ValueError(
"shape override must have non-negative elements")
elif validate_args:
dynamic_assertions += [
tf.assert_non_negative(
override_shape,
message="shape override must have non-negative elements")
]
is_both_nonscalar = _logical_and(_logical_not(base_is_scalar),
_logical_not(override_is_scalar))
if tf.contrib.util.constant_value(is_both_nonscalar) is not None:
if tf.contrib.util.constant_value(is_both_nonscalar):
raise ValueError("base distribution not scalar")
elif validate_args:
dynamic_assertions += [
tf.assert_equal(is_both_nonscalar,
False,
message="base distribution not scalar")
]
if not dynamic_assertions:
return override_shape
return control_flow_ops.with_dependencies(dynamic_assertions,
override_shape)
def _maybe_assert_valid_y(self, y):
if not self.validate_args:
return y
is_positive = tf.assert_non_negative(
y, message="Inverse transformation input must be greater than 0.")
less_than_one = tf.assert_less_equal(
y,
tf.constant(1., y.dtype),
message="Inverse transformation input must be less than or equal to 1.")
return control_flow_ops.with_dependencies([is_positive, less_than_one], y)
def _maybe_assert_valid_total_count(self, total_count, validate_args):
if not validate_args:
return total_count
return control_flow_ops.with_dependencies([
tf.assert_non_negative(
total_count, message="total_count must be non-negative."),
distribution_util.assert_integer_form(
total_count,
message="total_count cannot contain fractional components."),
], total_count)
def test_empty_tensor_doesnt_raise(self):
# A tensor is non-negative when it satisfies:
# For every element x_i in x, x_i >= 0
# and an empty tensor has no elements, so this is trivially satisfied.
# This is standard set theory.
with self.test_session():
empty = tf.constant([], name="empty")
with tf.control_dependencies([tf.assert_non_negative(empty)]):
out = tf.identity(empty)
out.eval()
def _maybe_assert_valid_total_count(self, total_count, validate_args):
if not validate_args:
return total_count
return control_flow_ops.with_dependencies([
tf.assert_non_negative(
total_count, message="total_count must be non-negative."),
distribution_util.assert_integer_form(
total_count,
message="total_count cannot contain fractional components."),
], total_count)
def _maybe_assert_valid(self, x):
if not self.validate_args:
return x
return control_flow_ops.with_dependencies([
tf.assert_non_negative(x, message="sample must be non-negative"),
tf.assert_less_equal(
x,
tf.ones([], self.concentration0.dtype),
message="sample must be no larger than `1`."),
], x)
def test_empty_tensor_doesnt_raise(self):
# A tensor is non-negative when it satisfies:
# For every element x_i in x, x_i >= 0
# and an empty tensor has no elements, so this is trivially satisfied.
# This is standard set theory.
with self.test_session():
empty = tf.constant([], name="empty")
with tf.control_dependencies([tf.assert_non_negative(empty)]):
out = tf.identity(empty)
out.eval()
def _inverse_log_det_jacobian(self, y):
# If event_ndims = 2,
# F^{-1}(y) = (-y, y), so DF^{-1}(y) = (-1, 1),
# so Log|DF^{-1}(y)| = Log[1, 1] = [0, 0].
zeros = tf.constant(0., dtype=y.dtype)
if self.validate_args:
zeros = control_flow_ops.with_dependencies(
[tf.assert_non_negative(y, message="Argument y was negative")],
zeros)
return zeros, zeros
def modify_aspect_ratio(rect, method='stretch', axis=-1, eps=1e-3, name='modify_aspect_ratio'):
if method == 'stretch':
return rect # No change.
with tf.name_scope(name) as scope:
center, size = geom.rect_center_size(rect)
with tf.control_dependencies([tf.assert_non_negative(size)]):
size = tf.identity(size)
size = tf.maximum(size, eps)
width = scalar_size(size, method, axis=axis, keepdims=True)
return geom.make_rect_center_size(center, width)
def _get_tol(self, tol):
if tol is None:
return tf.convert_to_tensor(0, dtype=self.loc.dtype)
tol = tf.convert_to_tensor(tol, dtype=self.loc.dtype)
if self.validate_args:
tol = control_flow_ops.with_dependencies([
tf.assert_non_negative(
tol, message="Argument 'tol' must be non-negative")
], tol)
return tol
def op(name,
images,
max_outputs=3,
display_name=None,
description=None,
collections=None):
"""Create an image summary op for use in a TensorFlow graph.
Arguments:
name: A unique name for the generated summary node.
images: A `Tensor` representing pixel data with shape `[k, h, w, c]`,
where `k` is the number of images, `h` and `w` are the height and
width of the images, and `c` is the number of channels, which
should be 1, 3, or 4. Any of the dimensions may be statically
unknown (i.e., `None`).
max_outputs: Optional `int` or rank-0 integer `Tensor`. At most this
many images will be emitted at each step. When more than
`max_outputs` many images are provided, the first `max_outputs` many
images will be used and the rest silently discarded.
display_name: Optional name for this summary in TensorBoard, as a
constant `str`. Defaults to `name`.
description: Optional long-form description for this summary, as a
constant `str`. Markdown is supported. Defaults to empty.
collections: Optional list of graph collections keys. The new
summary op is added to these collections. Defaults to
`[Graph Keys.SUMMARIES]`.
Returns:
A TensorFlow summary op.
"""
if display_name is None:
display_name = name
summary_metadata = metadata.create_summary_metadata(
display_name=display_name, description=description)
with tf.name_scope(name), \
tf.control_dependencies([tf.assert_rank(images, 4),
tf.assert_type(images, tf.uint8),
tf.assert_non_negative(max_outputs)]):
limited_images = images[:max_outputs]
encoded_images = tf.map_fn(tf.image.encode_png,
limited_images,
dtype=tf.string,
name='encode_each_image')
image_shape = tf.shape(images)
dimensions = tf.stack([
tf.as_string(image_shape[2], name='width'),
tf.as_string(image_shape[1], name='height')
],
name='dimensions')
tensor = tf.concat([dimensions, encoded_images], axis=0)
return tf.summary.tensor_summary(name='image_summary',
tensor=tensor,
collections=collections,
summary_metadata=summary_metadata)
def _get_tol(self, tol):
if tol is None:
return tf.convert_to_tensor(0, dtype=self.loc.dtype)
tol = tf.convert_to_tensor(tol, dtype=self.loc.dtype)
if self.validate_args:
tol = control_flow_ops.with_dependencies([
tf.assert_non_negative(
tol, message="Argument 'tol' must be non-negative")
], tol)
return tol
def _prepare(self):
# We need to put the conversion and check here because a user will likely
# want to decay the learning rate dynamically.
self._learning_rate_tensor = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._learning_rate, message='`learning_rate` must be non-negative')
], tf.convert_to_tensor(self._learning_rate, name='learning_rate_tensor'))
self._decay_tensor = tf.convert_to_tensor(
self._preconditioner_decay_rate, name='preconditioner_decay_rate')
super(StochasticGradientLangevinDynamics, self)._prepare()
def build_pred_var_interp(t_interp_X):
# Return the diagonal of the predictive covariance matrix
KXx = self.kern.K(self.X, t_interp_X)
sys1 = tf.matrix_triangular_solve(self.L, KXx, lower=True)
reduce_sum = tf.reduce_sum(tf.square(sys1), axis=0)
Kxx = self.kern.K(t_interp_X, diag=True)
pred_var = Kxx - reduce_sum
with tf.control_dependencies([tf.assert_non_negative(pred_var)]):
pred_var = tf.identity(pred_var)
# pred_var = tf.Print(pred_var, [pred_var])
return pred_var
def pad_up_to(vector, size, rank):
length_diff = tf.reshape(size - tf.shape(vector)[1], shape=(1, ))
with tf.control_dependencies([
tf.assert_non_negative(length_diff,
data=(vector, size, tf.shape(vector)))
]):
padding = tf.reshape(tf.concat([[0, 0, 0], length_diff, [0, 0] *
(rank - 1)],
axis=0),
shape=((rank + 1), 2))
return tf.pad(vector, padding, mode='constant')
def __init__(self,
dimension,
concentration,
validate_args=False,
allow_nan_stats=True,
name='LKJ'):
"""Construct LKJ distributions.
Args:
dimension: Python `int`. The dimension of the correlation matrices
to sample.
concentration: `float` or `double` `Tensor`. The positive concentration
parameter of the LKJ distributions. The pdf of a sample matrix `X` is
proportional to `det(X) ** (concentration - 1)`.
validate_args: Python `bool`, default `False`. When `True` distribution
parameters are checked for validity despite possibly degrading runtime
performance. When `False` invalid inputs may silently render incorrect
outputs.
allow_nan_stats: Python `bool`, default `True`. When `True`, statistics
(e.g., mean, mode, variance) use the value `NaN` to indicate the
result is undefined. When `False`, an exception is raised if one or
more of the statistic's batch members are undefined.
name: Python `str` name prefixed to Ops created by this class.
Raises:
ValueError: If `dimension` is negative.
"""
if dimension < 0:
raise ValueError(
'There are no negative-dimension correlation matrices.')
parameters = dict(locals())
with tf.name_scope(name, values=[dimension, concentration]):
concentration = tf.convert_to_tensor(
concentration,
name='concentration',
dtype=dtype_util.common_dtype([concentration],
preferred_dtype=tf.float32))
with tf.control_dependencies([
# concentration >= 1
# TODO(b/111451422) Generalize to concentration > 0.
tf.assert_non_negative(concentration - 1.),
] if validate_args else []):
self._dimension = dimension
self._concentration = tf.identity(concentration,
name='concentration')
super(LKJ, self).__init__(
dtype=self._concentration.dtype,
validate_args=validate_args,
allow_nan_stats=allow_nan_stats,
reparameterization_type=reparameterization.NOT_REPARAMETERIZED,
parameters=parameters,
graph_parents=[self._concentration],
name=name)
def _maybe_assert_valid_y(self, y):
if not self.validate_args:
return y
is_positive = tf.assert_non_negative(
y, message="Inverse transformation input must be greater than 0.")
less_than_one = tf.assert_less_equal(
y,
tf.constant(1., y.dtype),
message=
"Inverse transformation input must be less than or equal to 1.")
return control_flow_ops.with_dependencies([is_positive, less_than_one],
y)
def __init__(self,
dimension,
concentration,
validate_args=False,
allow_nan_stats=True,
name='LKJ'):
"""Construct LKJ distributions.
Args:
dimension: Python `int`. The dimension of the correlation matrices
to sample.
concentration: `float` or `double` `Tensor`. The positive concentration
parameter of the LKJ distributions. The pdf of a sample matrix `X` is
proportional to `det(X) ** (concentration - 1)`.
validate_args: Python `bool`, default `False`. When `True` distribution
parameters are checked for validity despite possibly degrading runtime
performance. When `False` invalid inputs may silently render incorrect
outputs.
allow_nan_stats: Python `bool`, default `True`. When `True`, statistics
(e.g., mean, mode, variance) use the value `NaN` to indicate the
result is undefined. When `False`, an exception is raised if one or
more of the statistic's batch members are undefined.
name: Python `str` name prefixed to Ops created by this class.
Raises:
ValueError: If `dimension` is negative.
"""
if dimension < 0:
raise ValueError(
'There are no negative-dimension correlation matrices.')
parameters = dict(locals())
with tf.name_scope(name, values=[dimension, concentration]):
concentration = tf.convert_to_tensor(
concentration,
name='concentration',
dtype=dtype_util.common_dtype([concentration],
preferred_dtype=tf.float32))
with tf.control_dependencies([
# concentration >= 1
# TODO(b/111451422) Generalize to concentration > 0.
tf.assert_non_negative(concentration - 1.),
] if validate_args else []):
self._dimension = dimension
self._concentration = tf.identity(concentration, name='concentration')
super(LKJ, self).__init__(
dtype=self._concentration.dtype,
validate_args=validate_args,
allow_nan_stats=allow_nan_stats,
reparameterization_type=reparameterization.NOT_REPARAMETERIZED,
parameters=parameters,
graph_parents=[self._concentration],
name=name)
def op(name,
images,
max_outputs=3,
display_name=None,
description=None,
collections=None):
"""Create an image summary op for use in a TensorFlow graph.
Arguments:
name: A unique name for the generated summary node.
images: A `Tensor` representing pixel data with shape `[k, w, h, c]`,
where `k` is the number of images, `w` and `h` are the width and
height of the images, and `c` is the number of channels, which
should be 1, 3, or 4. Any of the dimensions may be statically
unknown (i.e., `None`).
max_outputs: Optional `int` or rank-0 integer `Tensor`. At most this
many images will be emitted at each step. When more than
`max_outputs` many images are provided, the first `max_outputs` many
images will be used and the rest silently discarded.
display_name: Optional name for this summary in TensorBoard, as a
constant `str`. Defaults to `name`.
description: Optional long-form description for this summary, as a
constant `str`. Markdown is supported. Defaults to empty.
collections: Optional list of graph collections keys. The new
summary op is added to these collections. Defaults to
`[Graph Keys.SUMMARIES]`.
Returns:
A TensorFlow summary op.
"""
if display_name is None:
display_name = name
summary_metadata = metadata.create_summary_metadata(
display_name=display_name, description=description)
with tf.name_scope(name), \
tf.control_dependencies([tf.assert_rank(images, 4),
tf.assert_type(images, tf.uint8),
tf.assert_non_negative(max_outputs)]):
limited_images = images[:max_outputs]
encoded_images = tf.map_fn(tf.image.encode_png, limited_images,
dtype=tf.string,
name='encode_each_image')
image_shape = tf.shape(images)
dimensions = tf.stack([tf.as_string(image_shape[1], name='width'),
tf.as_string(image_shape[2], name='height')],
name='dimensions')
tensor = tf.concat([dimensions, encoded_images], axis=0)
return tf.summary.tensor_summary(name='image_summary',
tensor=tensor,
collections=collections,
summary_metadata=summary_metadata)
def _assert_non_negative_int32_scalar(self, x):
"""Helper which ensures that input is a non-negative, int32, scalar."""
x = tf.convert_to_tensor(x, name="x")
if x.dtype.base_dtype != tf.int32.base_dtype:
raise TypeError("%s.dtype=%s is not %s" % (x.name, x.dtype, tf.int32))
x_value_static = tensor_util.constant_value(x)
if x.get_shape().ndims is not None and x_value_static is not None:
if x.get_shape().ndims != 0:
raise ValueError("%s.ndims=%d is not 0 (scalar)" %
(x.name, x.get_shape().ndims))
if x_value_static < 0:
raise ValueError("%s.value=%d cannot be negative" %
(x.name, x_value_static))
return x
if self.validate_args:
x = control_flow_ops.with_dependencies(
[tf.assert_rank(x, 0),
tf.assert_non_negative(x)], x)
return x
def disable_some_bgs():
# Mutatis mutandis, all comments from disable_some_fgs apply.
shuffled_inds = tf.random_shuffle(bg_inds, seed=self._seed)
disable_place = (tf.shape(bg_inds)[0] - max_bg)
integrity_assertion = tf.assert_non_negative(
disable_place,
message="disable_place in disable_some_bgs is negative."
)
with tf.control_dependencies([integrity_assertion]):
disable_inds = shuffled_inds[:disable_place]
is_disabled = tf.sparse_to_dense(
sparse_indices=disable_inds,
sparse_values=True, default_value=False,
output_shape=tf.cast(proposals_label_shape, tf.int64),
validate_indices=False
)
return tf.where(
condition=is_disabled,
x=tf.fill(
dims=proposals_label_shape,
value=-1.
),
y=proposals_label
)
def __init__(self,
learning_rate,
preconditioner_decay_rate=0.95,
data_size=1,
burnin=25,
diagonal_bias=1e-8,
name=None,
parallel_iterations=10,
variable_scope=None):
default_name = 'StochasticGradientLangevinDynamics'
with tf.name_scope(name, default_name, [
learning_rate, preconditioner_decay_rate, data_size, burnin,
diagonal_bias
]):
if tf.executing_eagerly():
raise NotImplementedError('Eager execution currently not supported for '
' SGLD optimizer.')
if variable_scope is None:
var_scope_name = tf.get_default_graph().unique_name(
name or default_name)
with tf.variable_scope(var_scope_name) as scope:
self._variable_scope = scope
else:
self._variable_scope = variable_scope
self._preconditioner_decay_rate = tf.convert_to_tensor(
preconditioner_decay_rate, name='preconditioner_decay_rate')
self._data_size = tf.convert_to_tensor(
data_size, name='data_size')
self._burnin = tf.convert_to_tensor(burnin, name='burnin')
self._diagonal_bias = tf.convert_to_tensor(
diagonal_bias, name='diagonal_bias')
self._learning_rate = tf.convert_to_tensor(
learning_rate, name='learning_rate')
self._parallel_iterations = parallel_iterations
with tf.variable_scope(self._variable_scope):
self._counter = tf.get_variable(
'counter', initializer=0, trainable=False)
self._preconditioner_decay_rate = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._preconditioner_decay_rate,
message='`preconditioner_decay_rate` must be non-negative'),
tf.assert_less_equal(
self._preconditioner_decay_rate,
1.,
message='`preconditioner_decay_rate` must be at most 1.'),
], self._preconditioner_decay_rate)
self._data_size = control_flow_ops.with_dependencies([
tf.assert_greater(
self._data_size,
0,
message='`data_size` must be greater than zero')
], self._data_size)
self._burnin = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._burnin, message='`burnin` must be non-negative'),
tf.assert_integer(
self._burnin, message='`burnin` must be an integer')
], self._burnin)
self._diagonal_bias = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._diagonal_bias,
message='`diagonal_bias` must be non-negative')
], self._diagonal_bias)
super(StochasticGradientLangevinDynamics, self).__init__(
use_locking=False, name=name or default_name)
def __init__(self,
batch_size,
total_num_examples,
max_learning_rate=1.,
preconditioner_decay_rate=0.95,
burnin=25,
burnin_max_learning_rate=1e-6,
use_single_learning_rate=False,
name=None,
variable_scope=None):
default_name = 'VariationalSGD'
with tf.name_scope(name, default_name, [
max_learning_rate, preconditioner_decay_rate, batch_size, burnin,
burnin_max_learning_rate
]):
if variable_scope is None:
var_scope_name = tf.get_default_graph().unique_name(
name or default_name)
with tf.variable_scope(var_scope_name) as scope:
self._variable_scope = scope
else:
self._variable_scope = variable_scope
self._preconditioner_decay_rate = tf.convert_to_tensor(
preconditioner_decay_rate, name='preconditioner_decay_rate')
self._batch_size = tf.convert_to_tensor(batch_size, name='batch_size')
self._total_num_examples = tf.convert_to_tensor(
total_num_examples, name='total_num_examples')
self._burnin = tf.convert_to_tensor(burnin, name='burnin')
self._burnin_max_learning_rate = tf.convert_to_tensor(
burnin_max_learning_rate, name='burnin_max_learning_rate')
self._max_learning_rate = tf.convert_to_tensor(
max_learning_rate, name='max_learning_rate')
self._use_single_learning_rate = use_single_learning_rate
with tf.variable_scope(self._variable_scope):
self._counter = tf.get_variable(
'counter', initializer=0, trainable=False)
self._preconditioner_decay_rate = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._preconditioner_decay_rate,
message='`preconditioner_decay_rate` must be non-negative'),
tf.assert_less_equal(
self._preconditioner_decay_rate,
1.,
message='`preconditioner_decay_rate` must be at most 1.'),
], self._preconditioner_decay_rate)
self._batch_size = control_flow_ops.with_dependencies([
tf.assert_greater(
self._batch_size,
0,
message='`batch_size` must be greater than zero')
], self._batch_size)
self._total_num_examples = control_flow_ops.with_dependencies([
tf.assert_greater(
self._total_num_examples,
0,
message='`total_num_examples` must be greater than zero')
], self._total_num_examples)
self._burnin = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._burnin, message='`burnin` must be non-negative'),
tf.assert_integer(
self._burnin, message='`burnin` must be an integer')
], self._burnin)
self._burnin_max_learning_rate = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._burnin_max_learning_rate,
message='`burnin_max_learning_rate` must be non-negative')
], self._burnin_max_learning_rate)
self._max_learning_rate = control_flow_ops.with_dependencies([
tf.assert_non_negative(
self._max_learning_rate,
message='`max_learning_rate` must be non-negative')
], self._max_learning_rate)
super(VariationalSGD, self).__init__(
use_locking=False, name=name or default_name)
def __init__(self,
mean_direction,
concentration,
validate_args=False,
allow_nan_stats=True,
name='VonMisesFisher'):
"""Creates a new `VonMisesFisher` instance.
Args:
mean_direction: Floating-point `Tensor` with shape [B1, ... Bn, D].
A unit vector indicating the mode of the distribution, or the
unit-normalized direction of the mean. (This is *not* in general the
mean of the distribution; the mean is not generally in the support of
the distribution.) NOTE: `D` is currently restricted to <= 5.
concentration: Floating-point `Tensor` having batch shape [B1, ... Bn]
broadcastable with `mean_direction`. The level of concentration of
samples around the `mean_direction`. `concentration=0` indicates a
uniform distribution over the unit hypersphere, and `concentration=+inf`
indicates a `Deterministic` distribution (delta function) at
`mean_direction`.
validate_args: Python `bool`, default `False`. When `True` distribution
parameters are checked for validity despite possibly degrading runtime
performance. When `False` invalid inputs may silently render incorrect
outputs.
allow_nan_stats: Python `bool`, default `True`. When `True`,
statistics (e.g., mean, mode, variance) use the value "`NaN`" to
indicate the result is undefined. When `False`, an exception is raised
if one or more of the statistic's batch members are undefined.
name: Python `str` name prefixed to Ops created by this class.
Raises:
ValueError: For known-bad arguments, i.e. unsupported event dimension.
"""
parameters = dict(locals())
with tf.name_scope(name, values=[mean_direction, concentration]) as name:
dtype = dtype_util.common_dtype([mean_direction, concentration],
tf.float32)
mean_direction = tf.convert_to_tensor(
mean_direction, name='mean_direction', dtype=dtype)
concentration = tf.convert_to_tensor(
concentration, name='concentration', dtype=dtype)
assertions = [
tf.assert_non_negative(
concentration, message='`concentration` must be non-negative'),
tf.assert_greater(
tf.shape(mean_direction)[-1], 1,
message='`mean_direction` may not have scalar event shape'),
tf.assert_near(
1., tf.linalg.norm(mean_direction, axis=-1),
message='`mean_direction` must be unit-length')
] if validate_args else []
if mean_direction.shape.with_rank_at_least(1)[-1].value is not None:
if mean_direction.shape.with_rank_at_least(1)[-1].value > 5:
raise ValueError('vMF ndims > 5 is not currently supported')
elif validate_args:
assertions += [tf.assert_less_equal(
tf.shape(mean_direction)[-1], 5,
message='vMF ndims > 5 is not currently supported')]
with tf.control_dependencies(assertions):
self._mean_direction = tf.identity(mean_direction)
self._concentration = tf.identity(concentration)
tf.assert_same_float_dtype([self._mean_direction, self._concentration])
# mean_direction is always reparameterized.
# concentration is only for event_dim==3, via an inversion sampler.
reparameterization_type = (
reparameterization.FULLY_REPARAMETERIZED
if mean_direction.shape.with_rank_at_least(1)[-1].value == 3 else
reparameterization.NOT_REPARAMETERIZED)
super(VonMisesFisher, self).__init__(
dtype=self._concentration.dtype,
validate_args=validate_args,
allow_nan_stats=allow_nan_stats,
reparameterization_type=reparameterization_type,
parameters=parameters,
graph_parents=[self._mean_direction, self._concentration],
name=name)
def test_doesnt_raise_when_zero_and_positive(self):
with self.test_session():
lucas = tf.constant([0, 2], name="lucas")
with tf.control_dependencies([tf.assert_non_negative(lucas)]):
out = tf.identity(lucas)
out.eval()
def _inverse(self, y):
if self.validate_args:
y = control_flow_ops.with_dependencies(
[tf.assert_non_negative(y, message="Argument y was negative")], y)
return -y, y
def _maybe_assert_valid_x(self, x):
if not self.validate_args:
return x
is_valid = tf.assert_non_negative(
x, message="Forward transformation input must be at least 0.")
return control_flow_ops.with_dependencies([is_valid], x)